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in Basic Concepts of Chemistry by (48.1k points)

Calculate number of oxygen atoms in 88 g of CO2. Also calculate mass of CO having same number of oxygen atoms.

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Number of moles of CO2 in 88 g of CO2
= Mass of CO2 / Molar mass of CO2
= 88 g / 44 g/mol = 2 mol CO2
Since one mole of COcontains two moles of oxygen atoms, two moles of COcontain four moles of oxygen atoms. Hence,
1 mole of oxygen atoms contains 6.023 ×1023 oxygen atoms.
4 moles of oxygen atoms contain 6.023 × 1023 × 4 atoms = 2.4092 × 1024 oxygen atoms.
Since 1 mole of oxygen atom is present in 1 mole of CO, 4 moles of oxygen atoms are present in 4 moles of CO.
Mass of 4 moles of CO = number of moles of CO x gram molecular mass of CO
= 4 × (12 + 16)
= 4 × 28
= 112g

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